Device and method for achieving external dynamic compensation for display screen active area direct-current voltage drop

Abstract

The invention discloses a device and method for achieving external dynamic compensation for display screen active area direct-current voltage drop. The device comprises an input signal comparator, a processor and a voltage signal modulating device. The input signal comparator is used for detecting current or voltage consumption of a current display frame on an ELVDD bus in real time, the detected current or voltage consumption is converted into digital signals which are output to the processor. The processor compares the received digital signals with the stored current or voltage consumption reference value of the current display frame in reference data information, a current or voltage compensation value which needs to conduct compensation on the current display frame is obtained, and the current or voltage compensation value is output to the voltage signal modulating device in a digital mode. The voltage signal modulating device generates an analog-form compensation voltage according to the received current or voltage compensation value and then feeds the compensation voltage back to an ELVDD lead, and the voltage is applied to each pixel unit through an ELVDD bus in an active area, so that external dynamic compensation for the display screen active area direct-current voltage drop is achieved.

Description

technical field [0001] The present invention relates to the field of active matrix organic light emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED) display technology, in particular to an external device for dynamically compensating the DC voltage drop (IR drop) in the active area of ​​a display screen, having the external A display device for dynamically compensating a DC voltage drop device in an active area of ​​a display screen and an external dynamic compensation method for a DC voltage drop in an active area of ​​a display screen. Background technique [0002] In an AMOLED display system, the luminance of an organic light emitting diode (Organic Light Emitting Diode, OLED) is proportional to the driving current and the square of the driving voltage signal. Therefore, in the low grayscale display state, the luminance of the OLED is proportional to the The drive voltage signal is very sensitive to changes. In the AMOLED display system, because the IR dr...

AI Technical Summary

Problems solved by technology

Since the display brightness of the pixel unit of the OLED device is proportional to the square of the power supply voltage, the display brightness of the pixel unit of the OLED device is very sensitive to the change of the driving voltage signal in the low grayscale display state. This voltage drop, that is, IR drop, will cause The uneven display effect of the active area has a great impact on the display brightness of the active area

[0005] At the same time, since the IR drop is related to the display content of the screen, the existence of the IR drop also makes it difficult to accurately set the value of the parameter γ used by the display screen to represent the distortion of the output image to the input signal

Images